<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    // 页面输出1-100
    /* let i = 1
    while (i <= 100) {
      document.write(`这是第${i}个数<br>`)
      i++
    } */

    // 1加到100
    /* let i = 1
    let sum = 0
    while (i <= 100) {
      sum += i
      i++
    }
    document.write(`1加到100的结果为${sum}`) */

    // 1到100所有的偶数和
    let i = 0
    let sum = 0
    while (i <= 100) {
      if (i % 2 === 0 ) {
        sum += i
        
      }
      i++
    }
    console.log(sum)
  </script>
</body>
</html>